Means for applying antioffset material to the freshly-printed sides of sheets



BARBER H. M. MEANS FOR APPLYING ANTIOFFSET MATERIAL TO THE FRESHLYPRINTED SIDES OF SHEETS Filed Jan. 31, 1924 Patented ti an, 2?, i925HUWARD ll/[i BARBER, 0E STONINGTON, CONNECTICUT, ASSIGNOR TO C. B.COTTRELL &

SONSCOMJPANY, 0F STONINGTON, CONNECTICUT, A CORPORATION OF DELAWARE.

MEANS FOR APPLYING- ANTIOFJESET MATERIAL TO THE FRESHLY-PRINTED SIDES orsnnnrs.

Application filed January 31, 1924. Serial No. 689,685.

To all whom it may concem:

Be it known that l, HOWARD M. BARBER, a citizen ofthe United ,States,and resident of'Stonington, in the county of New London and State ofConnecticut, have invented a new and useful Improvement in Means forApplying Antiofiset Material to the Freshly-Printed Sides of Sheets, ofwhich the following is a specification.

in printing presses where slip sheets have been used for separating theprinted sheets in the pile to prevent oflsetting and smutting, theprinted sheets have been delivered from the press with their freshlyprinted sides up. It has heretofore been attempted to do away with theuse of the slip sheets by applying anti-offset material to the freshlyprinted side of the web or sheet. To produce the best results theanti-offset material, when in liquid form, must be deposited in a verythin and uniform film upon the freshly printed side of the web or sheet,for, if the anti-odset liquid is permitted to accumulate and drop ontosaid Web or sheet, it will not only discolor the web or sheet but willcause the sheets to stick together when stacked in a pile, be-

cause of the character of the anti-offset 1i uid used for this purpose.

My present invention is directed to means for so printing the sheetsthat they may be delivered from the printing mechanism with theirfreshly printed sides down; and so locating the anti-offset supplydevice under the sheets that the anti-odset material Will be directlyupwardly against the freshly printed sides of the sheets, any excessmaterial which might accumulate in quantities sufficient to form drops,being caused to drop away from instead of onto the sheets the objectbeing to provide means whereby the best class of color printing may beproduced and the sheets stacked n piles without the use of interposedslip sheets or the danger of oflsetting or smutting. V

A practical embodiment of my invention is represented in theaccompanying draw in which represents in diagram a multico or rotarysheetprinting press with my improvements applied thereto.

'Jihe prnting mechanism is herein shown are located around the undersideof the impression cylinder so as to permit the ready delivery of thesheets with their freshly printed sides down.

The sheet feed table is denoted by 10, the

sheet stop by 11 and the sheet feed rotary carrier by 12. This rotarycarrier is shown as provided With grippers 13 which are arranged to takethe sheets from the table 10 and transfer them to the grippers 14,carried by the impression cylinder 1.

Means for delivering the sheets with their freshly printed sides downare provided, which means in the present instance include the rotarycarrier 15' provided with grippers 16, arranged to take the freshlyprinted sheets from the grippers 14 of the impression cylinder 1 andtransfer the sheets to the endless delivery carrier 17 where the sheetsmay be grasped by the grippers 18.

The means which I have shown for applying the anti-offset material tothe freshly printed sides of the sheets is herein shown as comprising areservoir 19 for a liquid antioffset material, said reservoirbeinglocated under the sheets and being provided With atomizing nozzles 20,21, the nozzle 21 being in communication with the source of pressure,(not shown herein) through a supply pipe 22. Thus the anti-offset liquidwill be sprayed upwardly onto the freshly printed sides of the sheets ina thin even film as the sheets are delivered from'the printingmechanism; any accumulation of the liquid at the nozzle or any excesssupply being allowed to drop away from the sheets instead of onto thesheets, thus preventing any liability of the sheets becoming injured bysuch excess anti-offset liquid being dropped thereon.

It is obvious that the anti-offset applying device may beused inconnection with the printing of sheets either in one ormorc colors onone or both sides, Without departing from the spirit and scope of myinvention; the object being to deliver the sheets with their freshlyprinted sides down and to direct an anti-offset material upwardly intocontact with said freshly printed sidesof the sheets. i

What I claim is z 1. In a printing press, means for printing devicelocated under said sheet for directing an anti-offset material againstthe freshly printed side of the sheet.

4. In a printing press, means for printing on a sheet, means fordelivering the sheet with its freshly rinted side down, and a devicelocated an er said sheet for spraying an anti-offset liquid against thefreshly printed side of the sheet.

5. In a multi-color printing press, lneans for printing in multi-coloron a sheet, means for delivering the sheet with the freshly printed sidedown, and means for directing an anti-offset material against thefreshly printed side of the sheet.

.6. In a multi-color printing press, means for printin in multrcolor ona sheet, means for deliverm printed side own, and means for spraying ananti-offset liquid against the freshly printed side of the sheet.

7. In a multi-color printing press, means for printing in multi-color ona sheet, means for deliverin the sheet with the freshly printed sideown, and a device located under said sheet for directing an anti-offsetmaterial against the freshly printed side of i the sheet.

8. a multi-color printing press, means for printing in multi-color on asheet, means the sheet with the freshly for delivering the sheet withthe freshly printed side down, and a device located under said. sheetfor spraying an anti-offset liquid against the freshly printed side ofthe sheet.

9. In a multi-color rotary printing press, means for printing inmulti-color on one side of a sheet, comprisingan impression cylinder andits coacting form cylinders located around the underside of theimpression cylinder, means for delivering the sheet with the freshlyprinted side down, and means for directing an anti-offset materialagainst the freshly printed side of the sheet.

10. In a multi-color rotary printing press, means for printing inmulti-color on one side of a sheet, comprising an impression cylinderand its coacting form cylinders located around the underside of theimpression cylinder, means for delivering the sheet with the freshlyprinted side down, :.Il(\ means for spraying an anti-offset liquidagainst the freshly printed side of the sheet.

11. Ina multi-color rotary printing press. means for printing inmultiI-color on one side of a sheet, comprising arr impression cylinderand its coacting form cylinders located around the underside of theimpression cylinder, means for delivering the sheet with the freshlyprinted side down, and a device located under said sheet for directingan anti-offset material against the freshly printed side of the sheet.

12. In a multi-color rotary printing press, means for printing inmulti-color on one side of a sheet, comprising an impression cylinderand its coacting form cylinders located around the underside of theimpression cylinder, means for delivering the sheet with the freshlyprinted side down, and a device located under said sheet for spraying ananti-offset liquid against the freshly printed side of the sheet.

In testimony, that I claim the foregoing as my invention, I have signedmy name this 29th day of January, 1924-.

HOWARD M. BARBER.

